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Scanning laser source Lamb wave enhancements for defect characterisation
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Clough, A. R. and Edwards, R. S. (Rachel S.) (2014) Scanning laser source Lamb wave enhancements for defect characterisation. NDT & E International, Volume 62 . pp. 99-105. doi:10.1016/j.ndteint.2013.11.008 ISSN 0963-8695.
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Official URL: http://dx.doi.org/10.1016/j.ndteint.2013.11.008
Abstract
Surface-breaking defects in thin storage structures can cause costly component failure if left undetected. Here, a method for detecting and characterising surface breaking defects using near-field Lamb wave enhancements is presented for measurements in which a laser generation source passes over the defect. A dual laser scanning system is used to generate and detect Lamb waves in aluminium plates containing v-shaped laser micro-machined slots of different depths. Time–frequency analysis techniques are used to identify and track the magnitudes of individual wave-modes across a scan at different frequencies, and large enhancements in signal magnitude at certain frequencies are observed for the fundamental A0 and S0 wave modes when the laser source passes over the defect lip. The mechanisms responsible for this enhancement are identified and examined, and a characterisation process for identifying the position and severity of the defect is presented.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | NDT & E International | ||||
Publisher: | Elsevier Sci Ltd. | ||||
ISSN: | 0963-8695 | ||||
Official Date: | 2014 | ||||
Dates: |
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Volume: | Volume 62 | ||||
Page Range: | pp. 99-105 | ||||
DOI: | 10.1016/j.ndteint.2013.11.008 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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